Electric-circuit-wire insulator



(No Model.)

B. O. BLAKE & E. O. TRIMNELL.

ELEOTRIG CIRCUIT WIRE INSULATOR.

No. 342,320. Patented May 25, 1886.

Imus: (I .ZZQ'ZQMAL UNITED STATES PATENT OFFICE.

EDVIN COLlVELL BLAKE AND ERNEST CLAYTON TltlBlNELL, OF WORCESTER, ASSIGNORS, BY MESNE ASSIGNMENTS, TO SAID BLAKE AND TRIMNELL, AND GEORGE P. HUNT, OF BOSTON, MASSAOHYSETTS.

WlRE lNSULATOR.

SPECIFICATION forming part of Letters Patent No. 342,320, dated May 25, 1886.

Application filed February 25, 1886. Serial No. 193,]:3. ()To model.)

To ctZZ whom it may concern:

Be it known that we, EDWIN CoLwELL BLAKE and ERNEST CLAYTON TRIMNELL, of the city and county of Vorcester, of the Commonwealth of Massachusetts, have invented a new and useful Improvement in Electric-Circuit-\Vire Insulators; and we do hereby declare the same to be described in the following specification, and represented in the accomro panying drawings, of which- Figure l is a top view, Fig. 2 a broad side elevation, Fig. 3 a narrow side View, and Figs. l and 5 are a vertical, transverse, and median sections, of an insulator provided with our int5 vention, the nature of which is defined in the claims hereinafter referred to. The plane of section of the said Fig. at is through the two opposite middle notched ears, while the plane ot'section of Fig. 5 is at right angles to that of Fig. at.

'XVe are aware that it is not new to construct a telegraph-circuit-wire insulator with three ears extending upward from its top and having grooves or channels in them to receive the 2 5 wire, all being arranged and formed as repre sented in the United States Patent No. 154,451, dated August 25, 1874.

In carrying out our improvementwe have two sets of such ears, one set being on one side and the other on the opposite side of the body of the insulator, such body and ears being integral or in one piece of glass or other suitable non-conductor of electricity. One ear of each set is midway between the two others,

5 such median car being notched upward, and each of the others of the set being notched downward. The wire,whcn held by a set of the ears, goes through these notches and under and against the middle ear and over and rests 40 upon the two outer ears of the set. Between the two sets of cars the upper surface of the insulator is shaped very like that of a ridingsaddle-that is to say, it is concave lengthwise, as representedsuch being in order to 5 enable it to discharge either rain or melting snow laterally cit opposite sides of the insula tor without causing it to flow down upon either of the wires or their sustaining sets of cars,

all being as represented in the said drawings, in which A is the bodyof theinsulator, such body on its upperpart being a quadrilateral prism, and in its lower part, c, a cylinder. The three notched ears of each of two opposite sides of the prism a are shown at 13,13, and 13, they being arranged and formed as represented. The body is cup-shaped or concave atitslower end, as shown at g, and from the concavity upward within the body and concentric with the ex ternal surface of the cylindrical part 0 there extends a cylindrical chamber or socket, 71, provided with two pointed lugs or projections,

i it, they projecting from its inner curved surface, one of such lugs being alittlehigher than the other. The arrangement of a wire in each c; set of ears is exhibited at Z in dotted lines. The crown or upper surface of the body A is curved concavely, as shown in Fig. 2 at a b c, and laterally in Fig. 5 at d b (I, such being for the purpose hereinbei'ore stated.

Our insulator will support two electric circuit-wires and protect them, in a measure, from water that may result from melting of ice or snow that may gather 011 the top of the insulator. \Vhen the ears project upward 7 5 from the top of the insulator, and the wire is curved between them and over and upon such top, they operate to hold on the top snow that may fall or ice that may form there, which on melting and running down theside of the body 8 is likely to produce icicles, that, extending from the wire to the supporting-post, are liable to affect the proper insulation of such wire. \Vith our concave or saddle-shaped top to the body and arrangement of the two sets of cars 8 on opposite sides of such body, the snow or ice will not easily gather-on the ears and upon the parts of the wires in them. Such snow or ice on melting will be readily discharged without the water from it falling upon the ears or the 0 wires held by them.

\Ve do not claim an electric-wireinsulator having a set of three cars projecting upward from its top, as shown in the aforesaid patent; nordo we claim an electric-wireinsulatorhaving on one side only of it a set of three or more of such ears, such being as shown in the United States Patent No. 76,358, for when the ears are on but one side of the insulator but one wire can be supported by it, and such Wire, by the strains it brings upon the insulator, tends to loosen or injure its support,whereas when the insulator has sets of cars projecting from 0pposite sides of it and to sustain two wires, one wire balances the other, and there is no lateral strain tending to break the insulator or its connection with its post of support. Therefore We clairn- 1. An electric-circuit-wireinsulator having on each of two opposite sides of its body a set of three notched ears arranged with each oth- 15 er, substantially as set forth.

2. An electric-circuit-wireinsulator having on each of two opposite sides of its bodya set of three notched ears arranged with each other as set forth, and having the top of such body, 20 where between the two sets of ears, concave, substantially as represented.

EDWIN OOLWELL BLAKE. ERNEST CLAYTON TRIMNELL.

Witnesses:

GEo. H. ESTABROOK, CHARLOTTE H. NEWTON. 

